Fastening device



A g. 13, 1946. TINNERMAN 2,405,913

FASTENING DEVICE Filed March 13, 1944 INVENTOR E 4. ww

73m, vea/rq/r kflm Patented Aug. 13, 1946 FASTENING DEVICE GeorgeA. Tinnerman, Cleveland, Ohio, assignor to Tinnerman Products, Inc., Cleveland, Ohio, 7 a corporation of Ohio ApplicationxMarch 13, 1944, Serial No. 526,172

4 Claims. 1

This invention relates to a fastening device comprising a flexible strap adapted to embrace an article to be clamped and combined with means for effectively pulling the ends of the strap toward each other in circumferential distrap. This device comprises a bracket 2ll'anchored to one end of the. strap, a rotatable spindle 30 mounted in the. bracket and anchored to the other end of the strap, and a manual device 49 for rotating the spindle.-

rection and holding them in such position. The 5 In detail the bracket shown is a channel shaped invention, therefore, is in the nature of -a hose member having abase or intermediate portion 2|, clamp and provides very ready means by which two upright parallel webs or sides 22 and, and a yielding tubular member may be clamped very a pair of parallel lateral flanges 24 and Ziextightly upon a rigid tubular member which. it tending outwardly from the edges of the web 23. embraces, maintaining the two in gas-tight or The winding spindle 30 is journaled in two webs liquid-tight connection. The invention is well 2 2 and 23. It has a cylindrical body portion 3| adapted, for instance, for clamping a comparabifurcated by a diametric slot 32, and it has a tively large size hose which carries a high internal head portion 34, the exterior of which is grooved pressure. at 35 to make it a, worm wheel. The cylindrical One of the objects of my invention is to probody 3| is journaled in the bracket webs 22 and vide a clamp of the character described which 23 with the worm wheel head lying between the may be readily tightened from time to time should flanges 24 and 25. occasion require, and also may be immediately The member 40 has a. body journaled in the loosened whenever desired to free the conduit two flanges 24 and 25 and carries between them from the member to which it is attached. the helical rib 42 constituting a worm meshing To effect the result desired, I combine the fiexi- With the worm wheel 35. On the outer side of ble strap with an anchorage bracket to which the bracket web 24, the member 40 is formed one end of the strap is secured and which carries with an enlargement 44 on which is rigidly formed a revolvable spindle to which the other end of a fiat wing 45 providing means for manually turnthe strap is attached, and one of the objects of ing the worm. The worm is held in its mounted the invention is to combine with such a device means by which the spindle may be manually rotated with great leverage and locked in its clampin position.

The invention, comprising the means by which I accomplish the tight and powerful clamping, which at the same time is readily releasable, is illustrated in the drawing hereof and is hereinafter more fully described.

In the drawing, Fig. l is an elevation of one form of my clamping devic in position on a suitably supported conduit indicated with broken lines; Fig. 2 is a side elevation of the clamping device; Fig. 3 is a cross section, as indicated by the line 3-3 on Fig. 1; Fig. 4 is a fragmentary elevation of a modified embodiment of the invention.

As shown in Figs. 1 and 2, the broken lines A indicate a suitable flexible hose conduit adapted to be clamped on an embraced rigid tubular member B. In these figures, and in Fig. 3, l0 indicates a flexible strap of comparatively great strength, preferably made of sheet metal. This strap is shown as making two circuits about the hose to be clamped. In Fig. 4, a simpler embodiment is shown wherein the strap Illa makes only one circuit about the hose.

In either embodiment, I provide a winding and holding device secured to the two ends of the position by a split washer 4! occupying a groove in the worm body, on the outer side of the flange 25.

One end of the strap H], or ma, is bent back by a return bend to produce a hooked end indicated at II. This end portion is hooked over the base 2| of the bracket, the strap body preferably extending through the bracket, with the hook on the underside thereof, as shown in Figs. 1 and 4. The other end of the strap is bent around the spindle 30, as indicated at I2, and has a flat end portion [3 occupying the diametric slot 32 in the spindle.

It will be seen that when such a device as described is about a member to be clamped, the rotation of the worm, by simply manual turning of the wing 45, gives a relatively slow and hence powerful rotation to the spindle 30, which winds in that end of the band and pulls it tightly about the conduit being clamped. Whenever such tightness is secured the worm and warm wheel engagement automatically locks the band in its tightened position, the angle of the worm and that of the worm wheel being such that the Worm wheel cannot rotate the worm. Accordingly, the device provides a powerful clamping devic which is self -locking.

As there may be a considerable winding of the s r p about the spindle in my clamp, the same clamp is available for hose of considerably different wall thicknesses. It provides for the ready tightening from time to time, as the material of the hose may flow or deteriorate in use, and it is readily released whenever change of the hose is required.

The parts of the complete clamp are readily assembled. Thus, assuming that the parts are all separated, one end of the band is hooked across the base portion 2| of the bracket and the other end is brought into position between the webs 22 and 23. Then the spindle is shoved axially into place, its bifurcated shank straddling the flat end l3 of the band. Then the worm is inserted through the flange 24 and screwed along the worm wheel until the free end of the worm has passed through the flange 25. Then the washer 41 is put in place locking the worm in position, allowing to gradually rotate the worm wheel.

1 I claim:

1. In a clamp having a flexible band, tightening means comprising a bracket adapted to anchor one end of the band and defining spaced side portion and spaced flanges projecting outwardly from one side of said bracket, a spindle journaled in said side portions adapted for anchoring the other end of said band, and a driving device mounted in said'spaced flanges in connected relation with the spindle for rotating the spindle.

2. In a clamp having a flexible band, tightening means comprising a channel shaped bracket adapted to anchor one end of the band and defining spaced side portions, spaced flanges on one of said side portions projecting outwardly thereof, a pindle journaled in said side portions adapted for anchoring the other end of said band, and a driving device mounted in said spaced flanges in connected relation with said spindle for rotating the spindle.

3. In a clamp having a flexible band, tightening mean comprising a channel shaped bracket defining spaced side portions, an intermediate portion adapted to anchor one end of the band. and a pair of spaced outwardly projecting flanges on one of said side portions, a spindle journaled in said side portions adapted for anchoring the other end of the band, a gear on said spindle, and a driving gear mounted in said spaced flanges in mesh with said gear on the spindle for rotating the spindle.

4. In a clamp having a flexible band, tightening means comprising a'channel shaped bracket defining spaced side portions, an intermediate portion adapted to anchor one end of the band, and outwardly projecting flanges on one of said side portions, a spindle journaled in said side portions adapted for anchoring the other end of the band, a worm wheel on said spindle disposed between said outwardly projecting flanges, and a worm mounted in said'flanges in mesh with said worm wheel on the spindle for rotating the spindle.

GEORGE A. TINNERMAN. 

